[craftydev]

Visidata is great for this kind of thing, exploring and editing csv. https://www.visidata.org/ https://www.visidata.org/docs/edit/

[deviance]

(OP) I've had a short look at Visidata. Maybe it works or not on my described scenario (I should read the docs more carefully and make a test to be sure), but it's definitely in the direction I had in mind (a simple yet customizable enough tool for the job).

[leonim]

The tutorial is well written and gives a great tour of the tool: https://jsvine.github.io/intro-to-visidata/